problem with vendo 90 door light

[obs48167]

Newbie

I have a problem with the door light in my vendo 90.the one behind the sign works. But the one in the door keeps blowing.  Put a new bulb in and a new starter but the thing flashes and the blows the bulb.  could it be the ballast?

Thanks for your time
Mark

[Kilroy]

I am thinking replace the ballast.